package Stringsimilarity;

import java.io.*;
import java.util.Arrays;
import java.util.Comparator;
public class Solution {
	public static void main(String[] args)  throws Exception{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		//BufferedReader br = new BufferedReader(new FileReader("data.txt"));
		String line = br.readLine();
		int N = Integer.parseInt(line);
		
		double x=0,y=0;
		for(int i=0;i<=N-1;i++){
			line = br.readLine();
			String str[]=line.split(" ");
			x=(x+Integer.parseInt(str[0]))/(i+1);
			y=(y+Integer.parseInt(str[1]))/(i+1);
			
		}
		br.close();
	}
}